[Playing cards] Barcode is the abbreviation of bar code, which is a set of data symbols that are combined by a certain combination of strips and spaces with different widths and different reflectivities. The bar code of the product itself does not have the ability to resist anti-counterfeiting. It is just a kind of code for the goods, which is designed to use the computer to effectively manage the goods. However, if we can reasonably use bar code technology, including reasonable selection of bar code carrier, reasonable selection of bar code printing method, and reasonable selection of bar code printing position, it can play an anti-counterfeiting role.
The first is a reasonable method of selecting the bar code. The bar code is read by the computer, which requires the quality of the printed product to be high. The higher the quality of the printed product, the higher the printing equipment and precision required. Similarly, the price of the device is higher. The counterfeiters are unable to purchase high-precision equipment, which has an anti-counterfeiting effect on the goods, and the higher the price of the equipment. The better its anti-counterfeiting effect.
The second is to correctly design and use the barcode on the packaging to achieve the purpose of anti-counterfeiting:
First, invisible barcode
Invisible bar code can achieve the purpose of not destroying the overall effect of packaging and decoration, nor affecting the bar code characteristics. Similarly, after the invisible bar code is invisible, the general counterfeiter is difficult to imitate, the anti-counterfeiting effect is very good, and there is no color registration problem during printing.
Several forms of invisible barcodes:
(1) Coverage invisible barcode
The principle of this invisible bar code is to cover it with a specific film or coating after the bar code is printed, so that the bar code after processing is difficult to read. Coverage invisible bar code has good anti-counterfeiting effect, but its decoration effect is not ideal.
(2) Photochemically processed invisible barcodes
The ordinary visual bar code is processed optically, so that it is difficult for people's eyes to find traces after processing, and the ordinary wavelength light and non-specific light cannot be read. The invisible bar code is completely invisible, and the decoration is completely invisible. The effect is also very good, and can also be designed as a double anti-counterfeiting package.
(3) Invisible barcode printed by invisible ink
The barcode can be divided into a colorless functional ink printing barcode and a colored functional ink printing barcode. For the former, a barcode printed by a special ink such as a fluorescent ink, a thermochromic ink or a phosphorescent ink is generally used. This invisible barcode must be printed. With a specific illumination, the corresponding sensitive light source must be used in the identification of the barcode. This barcode is originally invisible, and the barcode printed on the colored functional ink is generally printed with a color-changing ink. Invisible barcodes printed with invisible inks have the same process as regular printing. However, its anti-aging problem remains to be resolved.
(4) Paper invisible barcode
The invisible barcode invisible medium and the paper are integrated into the whole body through special photochemical treatment, which can not be peeled off, can only be used for one-time use, can not be recognized by the human eye, can not be photographed by visible light, copying and copying, and can only be used when discerning The wavelength scanner reads the information in the bar code, and the scanner is also compatible with the general black and white bar code.
Second, two-dimensional barcode
For ordinary linear barcodes, it can be called one-dimensional barcodes, which has many advantages: easy to make, easy to read, fast input, high reliability, high standardization of reading devices, easy to use with computers and other control devices, performance Tend to perfection. However, its information capacity is small, and it is necessary to obtain a larger information capacity in its limited planar area. Extending a one-dimensional code to a two-dimensional barcode is the most efficient method.
The anti-counterfeiting principle of the two-dimensional barcode is to encrypt and encode the digitized information input by the barcode. For anti-counterfeiting applications, 2D barcodes are very suitable.
Third, the metal bar code
The strip of metal bar code is produced by electroplating the metal foil. Generally, the surface of the bar code is covered with a polyester film. The bar code is read by a special metal bar code reader. The advantage is that the surface is not afraid of stains. Generally, the bar code is read by the reflection of light. This bar code is read by electromagnetic waves. Only the distance between the reader and the bar code will affect the reading of the bar code. Its anti-aging ability is strong, and the surface polyester film has strong adaptability when used outdoors. The metal bar code can also be made into an invisible code, and an opaque protective film is used on the surface thereof, so that the human eye can not distinguish the existence of the bar code, thereby forming a cover type metal invisible bar code.
Four-dimensional metal bar code
Two-dimensional metal bar code is a high-tech multi-anti-counterfeiting new product made by complex technology such as coding technology, laser technology, computer technology, encryption anti-counterfeiting technology and photochemical technology. Its multi-anti-counterfeiting function is manifested in: high technology content, production process Complex; can store a large number of texts, photos, fingerprints; a bar code and a piece of information, change infinite; special encryption technology processing, difficult to decipher; only one-time use, is a national patent technology, the only one in the country.
The detection method of the authenticity of the two-dimensional metal bar code: 1 hand touch has a concave and convex feeling, the appearance has a three-dimensional sense, 2 can use a special bar code reader, 3 scan first, then use computer to decrypt to identify the authenticity, 4 use the money detector to check. Two-dimensional metal bar codes also have the advantage of metal bar codes.
Five, implied magnetic code
The principle of implied magnetic code is to make the powdered weak magnetic material into magnetic ink, and to mechanically (such as code strip, code width, code distance) and magnetic characteristics (remaining magnetic ratio, coercivity) by offset printing, silk screen printing, etc. Force ratio) performs mixed code copying. The characteristic is that the recording material contains trace elements, multi-feature codes, quantitative identification and low cost.
Implicit magnetic code types: (1) magnetic detection barcode; (2) random coding; (3) watermark magnetic code. The watermark magnetic code is a binary interval in the production, after dehumidification and demagnetization, which is patterned by a computer. After drying, it is retained in the magnetic oxide to produce a unique unchangeable 12-digit number. Add a special watermark magnetic verification track to determine whether the watermark magnetic number exists, correct or not, to distinguish between true and false